Understanding Enzymes

What is the primary role of enzymes in chemical reactions?

• To slow down reactions

• To become part of the reaction

• To speed up reactions

• To change the products of reactions

What determines the function of an enzyme?

• Its weight

• Its color

• Its shape

• Its size

What is formed when a substrate binds to an enzyme?

• Denatured enzyme

• Active site

• Product

• Enzyme-substrate complex

Which model explains the specificity of enzyme-substrate interaction?

• Induced fit model

• Lock and key model

• Fluid mosaic model

• Bohr model

What happens to an enzyme when it becomes denatured?

• It changes shape

• It speeds up

• It becomes more active

• It binds to more substrates

What is the effect of temperature on enzyme activity?

• Activity decreases with temperature

• Activity is unaffected by temperature

• Activity increases to an optimum point and then decreases

• Activity only increases with temperature

At what temperature is human enzyme activity typically optimized?

• 25 degrees Celsius

• 37 degrees Celsius

• 50 degrees Celsius

• 100 degrees Celsius

How does pH affect enzyme activity?

• Activity only increases with pH

• Activity is highest at an optimum pH and decreases outside this range

• Activity is unaffected by pH

• Activity is highest at extreme pH levels

What is the optimum pH for enzyme A?

• 7

• 3

• 10

• 14

What happens to enzyme activity when the pH is above or below the optimum level?

• Activity becomes unpredictable

• Activity decreases

• Activity remains constant

• Activity increases